Five astronauts successfully fly to Mars where they encounter seemingly friendly and advanced inhabitants who harbor covert plans to use their ship to invade Earth.。工部火药失窃，负责查案的云铮又离奇失踪。乌衣巷密探陆元、王栩临危受命，随着王尚书瞒报被揭发，御史崔真的遇刺，乌衣巷尘封多年的往事也浮出水面。祭天大典上，乌衣巷往日的同袍刀剑相向，大战一触即发...。